Puppybee is, though, a reason for a lot of things. Like drifts of blue fluff in springtime. But yes, good plan.
History... culture... storys... flashbacks... Necron foundations... my way of saying that this was not a legion but a planetsized population that is specialized in some way or form... The Onukath Foundation is miners that uses shovels on the end of their gauss weapons. The Samthok Foundation that is the primary defenders of the Crownworld. Yet not like the Arch gaurdians those primary focus are to defend royalty. Krome and Nyth that both specializes in full fontial attack yet Krome uses numbers and brute force, Nyth uses speed. Such as the Necron Jetbikes. The Kulatteh foundation that were fishers and hunters from all across the galaxy to ensure the best ways of capturing food and making it. They carry nets and whips into battle to slow their enemy. When getting closer... And many more...
The advantage of less lore is how open it is to interpretations. Look at Games Workshop. If you took all the rulebooks including codices, novels, etc. you probably get a hundred thousand or more pages. And even then with all of it existing, there are still soooo many holes in plot and lore or things that are just not quite definite. So yeah.... Too much lore only comes down into how interesting it is written/worded and how much is actually left to interpretation versus 'this is how it is, period'.
Alright 2 spots are left in 'The 6th Coin' - Both Eldar (Ulthwe). One being the Psyker position (Warlock or Bonesinger) the other being an Aspect Warrior / Ranger / Pathfinder position. The Imperials are all full (even after making a bonus spot because high demand :3) http://forum.eternalcrusade.com/threads/the-6th-coin-interest-ooc-thread-eldar-imp.59617/